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11f8502e3a
setup-ipsec-vpn/extras/ikev2setup.sh
hwdsl2 11f8502e3a Improve IKEv2 setup 
- Use default key size (2048 bits) when generating key pairs using
  certutil. This significantly reduces IKEv2 setup time on servers
  with less powerful CPUs, such as Raspberry Pis, while still providing
  sufficient security.
- Update docs
2021-03-05 21:33:41 -06:00

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#!/bin/bash
#
# Script to set up IKEv2 on Ubuntu, Debian, CentOS/RHEL and Amazon Linux 2
#
# The latest version of this script is available at:
# https://github.com/hwdsl2/setup-ipsec-vpn
#
# Copyright (C) 2020-2021 Lin Song <linsongui@gmail.com>
#
# This work is licensed under the Creative Commons Attribution-ShareAlike 3.0
# Unported License: http://creativecommons.org/licenses/by-sa/3.0/
#
# Attribution required: please include my name in any derivative and let me
# know how you have improved it!
export PATH="/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin"
exiterr() { echo "Error: $1" >&2; exit 1; }
bigecho() { echo "## $1"; }
check_ip() {
IP_REGEX='^(([0-9]|[1-9][0-9]|1[0-9]{2}|2[0-4][0-9]|25[0-5])\.){3}([0-9]|[1-9][0-9]|1[0-9]{2}|2[0-4][0-9]|25[0-5])$'
printf '%s' "$1" | tr -d '\n' | grep -Eq "$IP_REGEX"
}
check_dns_name() {
FQDN_REGEX='^([a-zA-Z0-9]([a-zA-Z0-9-]{0,61}[a-zA-Z0-9])?\.)+[a-zA-Z]{2,}$'
printf '%s' "$1" | tr -d '\n' | grep -Eq "$FQDN_REGEX"
}
check_run_as_root() {
if [ "$(id -u)" != 0 ]; then
exiterr "Script must be run as root. Try 'sudo bash $0'"
fi
}
check_os_type() {
os_arch=$(uname -m | tr -dc 'A-Za-z0-9_-')
if grep -qs -e "release 7" -e "release 8" /etc/redhat-release; then
os_type=centos
if grep -qs "Red Hat" /etc/redhat-release; then
os_type=rhel
fi
if grep -qs "release 7" /etc/redhat-release; then
os_ver=7
elif grep -qs "release 8" /etc/redhat-release; then
os_ver=8
fi
elif grep -qs "Amazon Linux release 2" /etc/system-release; then
os_type=amzn
os_ver=2
else
os_type=$(lsb_release -si 2>/dev/null)
[ -z "$os_type" ] && [ -f /etc/os-release ] && os_type=$(. /etc/os-release && printf '%s' "$ID")
case $os_type in
[Uu]buntu)
os_type=ubuntu
;;
[Dd]ebian)
os_type=debian
;;
[Rr]aspbian)
os_type=raspbian
;;
*)
exiterr "This script only supports Ubuntu, Debian, CentOS/RHEL 7/8 and Amazon Linux 2."
exit 1
;;
esac
os_ver=$(sed 's/\..*//' /etc/debian_version | tr -dc 'A-Za-z0-9')
fi
}
check_swan_install() {
ipsec_ver=$(/usr/local/sbin/ipsec --version 2>/dev/null)
swan_ver=$(printf '%s' "$ipsec_ver" | sed -e 's/Linux Libreswan //' -e 's/ (netkey).*//' -e 's/^U//' -e 's/\/K.*//')
if ( ! grep -qs "hwdsl2 VPN script" /etc/sysctl.conf && ! grep -qs "hwdsl2" /opt/src/run.sh ) \
|| ! printf '%s' "$ipsec_ver" | grep -q "Libreswan" \
|| [ ! -f /etc/ppp/chap-secrets ] || [ ! -f /etc/ipsec.d/passwd ]; then
cat 1>&2 <<'EOF'
Error: Your must first set up the IPsec VPN server before setting up IKEv2.
See: https://github.com/hwdsl2/setup-ipsec-vpn
EOF
exit 1
fi
case $swan_ver in
3.19|3.2[01235679]|3.3[12]|4.*)
true
;;
*)
cat 1>&2 <<EOF
Error: Libreswan version '$swan_ver' is not supported.
This script requires one of these versions:
3.19-3.23, 3.25-3.27, 3.29, 3.31-3.32 or 4.x
To update Libreswan, see:
https://github.com/hwdsl2/setup-ipsec-vpn#upgrade-libreswan
EOF
exit 1
;;
esac
}
check_utils_exist() {
command -v certutil >/dev/null 2>&1 || exiterr "'certutil' not found. Abort."
command -v pk12util >/dev/null 2>&1 || exiterr "'pk12util' not found. Abort."
}
check_container() {
in_container=0
if grep -qs "hwdsl2" /opt/src/run.sh; then
in_container=1
fi
}
show_usage() {
if [ -n "$1" ]; then
echo "Error: $1" >&2;
fi
cat 1>&2 <<EOF
Usage: bash $0 [options]
Options:
--auto run IKEv2 setup in auto mode using default options (for initial IKEv2 setup only)
--addclient [client name] add a new IKEv2 client using default options (after IKEv2 setup)
--exportclient [client name] export an existing IKEv2 client using default options (after IKEv2 setup)
--listclients list the names of existing IKEv2 clients (after IKEv2 setup)
--removeikev2 remove IKEv2 and delete all certificates and keys from the IPsec database
-h, --help show this help message and exit
To customize IKEv2 or client options, run this script without arguments.
EOF
exit 1
}
check_arguments() {
if [ "$use_defaults" = "1" ]; then
if grep -qs "conn ikev2-cp" /etc/ipsec.conf || [ -f /etc/ipsec.d/ikev2.conf ]; then
echo "Warning: Ignoring parameter '--auto'. Use '-h' for usage information." >&2
echo >&2
fi
fi
if [ "$((add_client_using_defaults + export_client_using_defaults + list_clients))" -gt 1 ]; then
show_usage "Invalid parameters. Specify only one of '--addclient', '--exportclient' or '--listclients'."
fi
if [ "$add_client_using_defaults" = "1" ]; then
if ! grep -qs "conn ikev2-cp" /etc/ipsec.conf && [ ! -f /etc/ipsec.d/ikev2.conf ]; then
exiterr "You must first set up IKEv2 before adding a new client."
fi
if [ -z "$client_name" ] || [ "${#client_name}" -gt "64" ] \
|| printf '%s' "$client_name" | LC_ALL=C grep -q '[^A-Za-z0-9_-]\+' \
|| case $client_name in -*) true;; *) false;; esac; then
exiterr "Invalid client name. Use one word only, no special characters except '-' and '_'."
elif certutil -L -d sql:/etc/ipsec.d -n "$client_name" >/dev/null 2>&1; then
exiterr "Invalid client name. Client '$client_name' already exists."
fi
fi
if [ "$export_client_using_defaults" = "1" ]; then
if ! grep -qs "conn ikev2-cp" /etc/ipsec.conf && [ ! -f /etc/ipsec.d/ikev2.conf ]; then
exiterr "You must first set up IKEv2 before exporting a client configuration."
fi
get_server_address
if [ -z "$client_name" ] || [ "${#client_name}" -gt "64" ] \
|| printf '%s' "$client_name" | LC_ALL=C grep -q '[^A-Za-z0-9_-]\+' \
|| [ "$client_name" = "IKEv2 VPN CA" ] || [ "$client_name" = "$server_addr" ] \
|| case $client_name in -*) true;; *) false;; esac \
|| ! certutil -L -d sql:/etc/ipsec.d -n "$client_name" >/dev/null 2>&1; then
exiterr "Invalid client name, or client does not exist."
fi
fi
if [ "$list_clients" = "1" ]; then
if ! grep -qs "conn ikev2-cp" /etc/ipsec.conf && [ ! -f /etc/ipsec.d/ikev2.conf ]; then
exiterr "You must first set up IKEv2 before listing clients."
fi
fi
if [ "$remove_ikev2" = "1" ]; then
if ! grep -qs "conn ikev2-cp" /etc/ipsec.conf && [ ! -f /etc/ipsec.d/ikev2.conf ]; then
exiterr "Cannot remove IKEv2 because it has not been set up on this server."
fi
if [ "$((add_client_using_defaults + export_client_using_defaults + list_clients + use_defaults))" -gt 0 ]; then
show_usage "Invalid parameters. '--removeikev2' cannot be specified with other parameters."
fi
fi
}
check_server_dns_name() {
if [ -n "$VPN_DNS_NAME" ]; then
check_dns_name "$VPN_DNS_NAME" || exiterr "Invalid DNS name. 'VPN_DNS_NAME' must be a fully qualified domain name (FQDN)."
fi
}
check_custom_dns() {
if { [ -n "$VPN_DNS_SRV1" ] && ! check_ip "$VPN_DNS_SRV1"; } \
|| { [ -n "$VPN_DNS_SRV2" ] && ! check_ip "$VPN_DNS_SRV2"; } then
exiterr "The DNS server specified is invalid."
fi
}
check_ca_cert_exists() {
if certutil -L -d sql:/etc/ipsec.d -n "IKEv2 VPN CA" >/dev/null 2>&1; then
exiterr "Certificate 'IKEv2 VPN CA' already exists."
fi
}
check_server_cert_exists() {
if certutil -L -d sql:/etc/ipsec.d -n "$server_addr" >/dev/null 2>&1; then
echo "Error: Certificate '$server_addr' already exists." >&2
echo "Abort. No changes were made." >&2
exit 1
fi
}
check_client_cert_exists() {
if certutil -L -d sql:/etc/ipsec.d -n "$client_name" >/dev/null 2>&1; then
echo "Error: Client '$client_name' already exists." >&2
echo "Abort. No changes were made." >&2
exit 1
fi
}
check_swan_ver() {
if [ "$in_container" = "0" ]; then
swan_ver_url="https://dl.ls20.com/v1/$os_type/$os_ver/swanverikev2?arch=$os_arch&ver=$swan_ver&auto=$use_defaults"
else
swan_ver_url="https://dl.ls20.com/v1/docker/$os_arch/swanverikev2?ver=$swan_ver&auto=$use_defaults"
fi
swan_ver_latest=$(wget -t 3 -T 15 -qO- "$swan_ver_url")
}
run_swan_update() {
update_url=vpnupgrade
if [ "$os_type" = "centos" ] || [ "$os_type" = "rhel" ]; then
update_url=vpnupgrade-centos
elif [ "$os_type" = "amzn" ]; then
update_url=vpnupgrade-amzn
fi
TMPDIR=$(mktemp -d /tmp/vpnupg.XXX 2>/dev/null)
if [ -d "$TMPDIR" ]; then
set -x
if wget -t 3 -T 30 -q -O "$TMPDIR/vpnupg.sh" "https://git.io/$update_url"; then
/bin/sh "$TMPDIR/vpnupg.sh"
fi
{ set +x; } 2>&-
[ ! -s "$TMPDIR/vpnupg.sh" ] && echo "Error: Could not download update script." >&2
/bin/rm -f "$TMPDIR/vpnupg.sh"
/bin/rmdir "$TMPDIR"
else
echo "Error: Could not create temporary directory." >&2
fi
read -n 1 -s -r -p "Press any key to continue IKEv2 setup..."
echo
}
select_swan_update() {
if printf '%s' "$swan_ver_latest" | grep -Eq '^([3-9]|[1-9][0-9])\.([0-9]|[1-9][0-9])$' \
&& [ "$swan_ver" != "$swan_ver_latest" ] \
&& printf '%s\n%s' "$swan_ver" "$swan_ver_latest" | sort -C -V; then
echo "Note: A newer version of Libreswan ($swan_ver_latest) is available."
echo " It is recommended to update Libreswan before setting up IKEv2."
if [ "$in_container" = "0" ]; then
echo
printf "Do you want to update Libreswan? [Y/n] "
read -r response
case $response in
[yY][eE][sS]|[yY]|'')
echo
run_swan_update
;;
*)
echo
;;
esac
else
echo " To update this Docker image, see: https://git.io/updatedockervpn"
echo
printf "Do you want to continue anyway? [y/N] "
read -r response
case $response in
[yY][eE][sS]|[yY])
echo
;;
*)
echo "Abort. No changes were made."
exit 1
;;
esac
fi
fi
}
show_welcome_message() {
clear
cat <<'EOF'
Welcome! Use this script to set up IKEv2 after setting up your own IPsec VPN server.
Alternatively, you may manually set up IKEv2. See: https://git.io/ikev2
I need to ask you a few questions before starting setup.
You can use the default options and just press enter if you are OK with them.
EOF
}
show_start_message() {
bigecho "Starting IKEv2 setup in auto mode, using default options."
}
show_add_client_message() {
bigecho "Adding a new IKEv2 client '$client_name', using default options."
}
show_export_client_message() {
bigecho "Exporting existing IKEv2 client '$client_name', using default options."
}
get_export_dir() {
export_to_home_dir=0
if grep -qs "hwdsl2" /opt/src/run.sh; then
export_dir="/etc/ipsec.d/"
else
export_dir=~/
if [ -n "$SUDO_USER" ] && getent group "$SUDO_USER" >/dev/null 2>&1; then
user_home_dir=$(getent passwd "$SUDO_USER" 2>/dev/null | cut -d: -f6)
if [ -d "$user_home_dir" ] && [ "$user_home_dir" != "/" ]; then
export_dir="$user_home_dir/"
export_to_home_dir=1
fi
fi
fi
}
get_server_ip() {
bigecho "Trying to auto discover IP of this server..."
public_ip=$(dig @resolver1.opendns.com -t A -4 myip.opendns.com +short)
check_ip "$public_ip" || public_ip=$(wget -t 3 -T 15 -qO- http://ipv4.icanhazip.com)
}
get_server_address() {
server_addr=$(grep -s "leftcert=" /etc/ipsec.d/ikev2.conf | cut -f2 -d=)
[ -z "$server_addr" ] && server_addr=$(grep -s "leftcert=" /etc/ipsec.conf | cut -f2 -d=)
check_ip "$server_addr" || check_dns_name "$server_addr" || exiterr "Could not get VPN server address."
}
list_existing_clients() {
echo "Checking for existing IKEv2 client(s)..."
certutil -L -d sql:/etc/ipsec.d | grep -v -e '^$' -e 'IKEv2 VPN CA' -e '\.' | tail -n +3 | cut -f1 -d ' '
}
enter_server_address() {
echo "Do you want IKEv2 VPN clients to connect to this server using a DNS name,"
printf "e.g. vpn.example.com, instead of its IP address? [y/N] "
read -r response
case $response in
[yY][eE][sS]|[yY])
use_dns_name=1
echo
;;
*)
use_dns_name=0
echo
;;
esac
if [ "$use_dns_name" = "1" ]; then
read -rp "Enter the DNS name of this VPN server: " server_addr
until check_dns_name "$server_addr"; do
echo "Invalid DNS name. You must enter a fully qualified domain name (FQDN)."
read -rp "Enter the DNS name of this VPN server: " server_addr
done
else
get_server_ip
echo
read -rp "Enter the IPv4 address of this VPN server: [$public_ip] " server_addr
[ -z "$server_addr" ] && server_addr="$public_ip"
until check_ip "$server_addr"; do
echo "Invalid IP address."
read -rp "Enter the IPv4 address of this VPN server: [$public_ip] " server_addr
[ -z "$server_addr" ] && server_addr="$public_ip"
done
fi
}
enter_client_name() {
echo
echo "Provide a name for the IKEv2 VPN client."
echo "Use one word only, no special characters except '-' and '_'."
read -rp "Client name: " client_name
while [ -z "$client_name" ] || [ "${#client_name}" -gt "64" ] \
|| printf '%s' "$client_name" | LC_ALL=C grep -q '[^A-Za-z0-9_-]\+' \
|| case $client_name in -*) true;; *) false;; esac \
|| certutil -L -d sql:/etc/ipsec.d -n "$client_name" >/dev/null 2>&1; do
if [ -z "$client_name" ] || [ "${#client_name}" -gt "64" ] \
|| printf '%s' "$client_name" | LC_ALL=C grep -q '[^A-Za-z0-9_-]\+' \
|| case $client_name in -*) true;; *) false;; esac; then
echo "Invalid client name."
else
echo "Invalid client name. Client '$client_name' already exists."
fi
read -rp "Client name: " client_name
done
}
enter_client_name_with_defaults() {
echo
echo "Provide a name for the IKEv2 VPN client."
echo "Use one word only, no special characters except '-' and '_'."
read -rp "Client name: [vpnclient] " client_name
[ -z "$client_name" ] && client_name=vpnclient
while [ "${#client_name}" -gt "64" ] \
|| printf '%s' "$client_name" | LC_ALL=C grep -q '[^A-Za-z0-9_-]\+' \
|| case $client_name in -*) true;; *) false;; esac \
|| certutil -L -d sql:/etc/ipsec.d -n "$client_name" >/dev/null 2>&1; do
if [ "${#client_name}" -gt "64" ] \
|| printf '%s' "$client_name" | LC_ALL=C grep -q '[^A-Za-z0-9_-]\+' \
|| case $client_name in -*) true;; *) false;; esac; then
echo "Invalid client name."
else
echo "Invalid client name. Client '$client_name' already exists."
fi
read -rp "Client name: [vpnclient] " client_name
[ -z "$client_name" ] && client_name=vpnclient
done
}
enter_client_name_for_export() {
echo
list_existing_clients
get_server_address
echo
read -rp "Enter the name of the IKEv2 client to export: " client_name
while [ -z "$client_name" ] || [ "${#client_name}" -gt "64" ] \
|| printf '%s' "$client_name" | LC_ALL=C grep -q '[^A-Za-z0-9_-]\+' \
|| [ "$client_name" = "IKEv2 VPN CA" ] || [ "$client_name" = "$server_addr" ] \
|| case $client_name in -*) true;; *) false;; esac \
|| ! certutil -L -d sql:/etc/ipsec.d -n "$client_name" >/dev/null 2>&1; do
echo "Invalid client name, or client does not exist."
read -rp "Enter the name of the IKEv2 client to export: " client_name
done
}
enter_client_cert_validity() {
echo
echo "Specify the validity period (in months) for this VPN client certificate."
read -rp "Enter a number between 1 and 120: [120] " client_validity
[ -z "$client_validity" ] && client_validity=120
while printf '%s' "$client_validity" | LC_ALL=C grep -q '[^0-9]\+' \
|| [ "$client_validity" -lt "1" ] || [ "$client_validity" -gt "120" ] \
|| [ "$client_validity" != "$((10#$client_validity))" ]; do
echo "Invalid validity period."
read -rp "Enter a number between 1 and 120: [120] " client_validity
[ -z "$client_validity" ] && client_validity=120
done
}
enter_custom_dns() {
echo
echo "By default, clients are set to use Google Public DNS when the VPN is active."
printf "Do you want to specify custom DNS servers for IKEv2? [y/N] "
read -r response
case $response in
[yY][eE][sS]|[yY])
use_custom_dns=1
;;
*)
use_custom_dns=0
dns_server_1=8.8.8.8
dns_server_2=8.8.4.4
dns_servers="8.8.8.8 8.8.4.4"
;;
esac
if [ "$use_custom_dns" = "1" ]; then
read -rp "Enter primary DNS server: " dns_server_1
until check_ip "$dns_server_1"; do
echo "Invalid DNS server."
read -rp "Enter primary DNS server: " dns_server_1
done
read -rp "Enter secondary DNS server (Enter to skip): " dns_server_2
until [ -z "$dns_server_2" ] || check_ip "$dns_server_2"; do
echo "Invalid DNS server."
read -rp "Enter secondary DNS server (Enter to skip): " dns_server_2
done
if [ -n "$dns_server_2" ]; then
dns_servers="$dns_server_1 $dns_server_2"
else
dns_servers="$dns_server_1"
fi
else
echo "Using Google Public DNS (8.8.8.8, 8.8.4.4)."
fi
echo
}
check_mobike_support() {
mobike_support=0
case $swan_ver in
3.2[35679]|3.3[12]|4.*)
mobike_support=1
;;
esac
if uname -m | grep -qi -e '^arm' -e '^aarch64'; then
modprobe -q configs
if [ -f /proc/config.gz ]; then
if ! zcat /proc/config.gz | grep -q "CONFIG_XFRM_MIGRATE=y"; then
mobike_support=0
fi
else
mobike_support=0
fi
fi
kernel_conf="/boot/config-$(uname -r)"
if [ -f "$kernel_conf" ]; then
if ! grep -qs "CONFIG_XFRM_MIGRATE=y" "$kernel_conf"; then
mobike_support=0
fi
fi
# Linux kernels on Ubuntu do not support MOBIKE
if [ "$in_container" = "0" ]; then
if [ "$os_type" = "ubuntu" ] || uname -v | grep -qi ubuntu; then
mobike_support=0
fi
else
if uname -v | grep -qi ubuntu; then
mobike_support=0
fi
fi
echo -n "## Checking for MOBIKE support... "
if [ "$mobike_support" = "1" ]; then
echo "available"
else
echo "not available"
fi
}
select_mobike() {
mobike_enable=0
if [ "$mobike_support" = "1" ]; then
echo
echo "The MOBIKE IKEv2 extension allows VPN clients to change network attachment points,"
echo "e.g. switch between mobile data and Wi-Fi and keep the IPsec tunnel up on the new IP."
echo
printf "Do you want to enable MOBIKE support? [Y/n] "
read -r response
case $response in
[yY][eE][sS]|[yY]|'')
mobike_enable=1
;;
*)
mobike_enable=0
;;
esac
fi
}
select_p12_password() {
cat <<'EOF'
Client configuration will be exported as .p12, .sswan and .mobileconfig files,
which contain the client certificate, private key and CA certificate.
To protect these files, this script can generate a random password for you,
which will be displayed when finished.
EOF
printf "Do you want to specify your own password instead? [y/N] "
read -r response
case $response in
[yY][eE][sS]|[yY])
use_own_password=1
echo
;;
*)
use_own_password=0
echo
;;
esac
}
select_menu_option() {
echo "IKEv2 is already set up on this server."
echo
echo "Select an option:"
echo " 1) Add a new client"
echo " 2) Export configuration for an existing client"
echo " 3) List existing clients"
echo " 4) Remove IKEv2"
echo " 5) Exit"
read -rp "Option: " selected_option
until [[ "$selected_option" =~ ^[1-5]$ ]]; do
printf '%s\n' "$selected_option: invalid selection."
read -rp "Option: " selected_option
done
}
confirm_setup_options() {
cat <<EOF
Below are the IKEv2 setup options you selected.
Please double check before continuing!
======================================
VPN server address: $server_addr
VPN client name: $client_name
EOF
if [ "$client_validity" = "1" ]; then
echo "Client cert valid for: 1 month"
else
echo "Client cert valid for: $client_validity months"
fi
if [ "$mobike_support" = "1" ]; then
if [ "$mobike_enable" = "1" ]; then
echo "MOBIKE support: Enable"
else
echo "MOBIKE support: Disable"
fi
else
echo "MOBIKE support: Not available"
fi
cat <<EOF
DNS server(s): $dns_servers
======================================
EOF
printf "We are ready to set up IKEv2 now. Do you want to continue? [y/N] "
read -r response
case $response in
[yY][eE][sS]|[yY])
echo
;;
*)
echo "Abort. No changes were made."
exit 1
;;
esac
}
create_client_cert() {
bigecho "Generating client certificate..."
sleep $((RANDOM % 3 + 1))
certutil -z <(head -c 1024 /dev/urandom) \
-S -c "IKEv2 VPN CA" -n "$client_name" \
-s "O=IKEv2 VPN,CN=$client_name" \
-k rsa -v "$client_validity" \
-d sql:/etc/ipsec.d -t ",," \
--keyUsage digitalSignature,keyEncipherment \
--extKeyUsage serverAuth,clientAuth -8 "$client_name" >/dev/null 2>&1 || exiterr "Failed to create client certificate."
}
export_p12_file() {
bigecho "Creating client configuration..."
if [ "$use_own_password" = "1" ]; then
cat <<'EOF'
Enter a *secure* password to protect the client configuration files.
When importing into an iOS or macOS device, this password cannot be empty.
EOF
else
p12_password=$(LC_CTYPE=C tr -dc 'A-HJ-NPR-Za-km-z2-9' < /dev/urandom | head -c 16)
[ -z "$p12_password" ] && exiterr "Could not generate a random password for .p12 file."
fi
p12_file="$export_dir$client_name.p12"
if [ "$use_own_password" = "1" ]; then
pk12util -d sql:/etc/ipsec.d -n "$client_name" -o "$p12_file" || exit 1
else
pk12util -W "$p12_password" -d sql:/etc/ipsec.d -n "$client_name" -o "$p12_file" >/dev/null || exit 1
fi
if [ "$export_to_home_dir" = "1" ]; then
chown "$SUDO_USER:$SUDO_USER" "$p12_file"
fi
chmod 600 "$p12_file"
}
install_base64_uuidgen() {
if ! command -v base64 >/dev/null 2>&1 || ! command -v uuidgen >/dev/null 2>&1; then
bigecho "Installing required packages..."
if [ "$os_type" = "ubuntu" ] || [ "$os_type" = "debian" ] || [ "$os_type" = "raspbian" ]; then
export DEBIAN_FRONTEND=noninteractive
(
set -x
apt-get -yqq update
) || exiterr "'apt-get update' failed."
fi
fi
if ! command -v base64 >/dev/null 2>&1; then
if [ "$os_type" = "ubuntu" ] || [ "$os_type" = "debian" ] || [ "$os_type" = "raspbian" ]; then
(
set -x
apt-get -yqq install coreutils >/dev/null
) || exiterr "'apt-get install' failed."
else
(
set -x
yum -y -q install coreutils >/dev/null
) || exiterr "'yum install' failed."
fi
fi
if ! command -v uuidgen >/dev/null 2>&1; then
if [ "$os_type" = "ubuntu" ] || [ "$os_type" = "debian" ] || [ "$os_type" = "raspbian" ]; then
(
set -x
apt-get -yqq install uuid-runtime >/dev/null
) || exiterr "'apt-get install' failed."
else
(
set -x
yum -y -q install util-linux >/dev/null
) || exiterr "'yum install' failed."
fi
fi
}
create_mobileconfig() {
[ -z "$server_addr" ] && get_server_address
p12_base64=$(base64 -w 52 "$export_dir$client_name.p12")
[ -z "$p12_base64" ] && exiterr "Could not encode .p12 file."
ca_base64=$(certutil -L -d sql:/etc/ipsec.d -n "IKEv2 VPN CA" -a | grep -v CERTIFICATE)
[ -z "$ca_base64" ] && exiterr "Could not encode IKEv2 VPN CA certificate."
uuid1=$(uuidgen)
[ -z "$uuid1" ] && exiterr "Could not generate UUID value."
mc_file="$export_dir$client_name.mobileconfig"
cat > "$mc_file" <<EOF
<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
<plist version="1.0">
<dict>
<key>PayloadContent</key>
<array>
<dict>
<key>IKEv2</key>
<dict>
<key>AuthenticationMethod</key>
<string>Certificate</string>
<key>ChildSecurityAssociationParameters</key>
<dict>
<key>DiffieHellmanGroup</key>
<integer>14</integer>
<key>EncryptionAlgorithm</key>
<string>AES-256-GCM</string>
<key>LifeTimeInMinutes</key>
<integer>1410</integer>
</dict>
<key>DeadPeerDetectionRate</key>
<string>Medium</string>
<key>DisableRedirect</key>
<true/>
<key>EnableCertificateRevocationCheck</key>
<integer>0</integer>
<key>EnablePFS</key>
<integer>0</integer>
<key>IKESecurityAssociationParameters</key>
<dict>
<key>DiffieHellmanGroup</key>
<integer>14</integer>
<key>EncryptionAlgorithm</key>
<string>AES-256</string>
<key>IntegrityAlgorithm</key>
<string>SHA2-256</string>
<key>LifeTimeInMinutes</key>
<integer>1410</integer>
</dict>
<key>LocalIdentifier</key>
<string>$client_name</string>
<key>PayloadCertificateUUID</key>
<string>$uuid1</string>
<key>OnDemandEnabled</key>
<integer>0</integer>
<key>OnDemandRules</key>
<array>
<dict>
<key>Action</key>
<string>Connect</string>
</dict>
</array>
<key>RemoteAddress</key>
<string>$server_addr</string>
<key>RemoteIdentifier</key>
<string>$server_addr</string>
<key>UseConfigurationAttributeInternalIPSubnet</key>
<integer>0</integer>
</dict>
<key>IPv4</key>
<dict>
<key>OverridePrimary</key>
<integer>1</integer>
</dict>
<key>PayloadDescription</key>
<string>Configures VPN settings</string>
<key>PayloadDisplayName</key>
<string>VPN</string>
<key>PayloadIdentifier</key>
<string>com.apple.vpn.managed.$(uuidgen)</string>
<key>PayloadType</key>
<string>com.apple.vpn.managed</string>
<key>PayloadUUID</key>
<string>$(uuidgen)</string>
<key>PayloadVersion</key>
<integer>1</integer>
<key>Proxies</key>
<dict>
<key>HTTPEnable</key>
<integer>0</integer>
<key>HTTPSEnable</key>
<integer>0</integer>
</dict>
<key>UserDefinedName</key>
<string>$server_addr</string>
<key>VPNType</key>
<string>IKEv2</string>
</dict>
<dict>
<key>PayloadCertificateFileName</key>
<string>$client_name</string>
<key>PayloadContent</key>
<data>
$p12_base64
</data>
<key>PayloadDescription</key>
<string>Adds a PKCS#12-formatted certificate</string>
<key>PayloadDisplayName</key>
<string>$client_name</string>
<key>PayloadIdentifier</key>
<string>com.apple.security.pkcs12.$(uuidgen)</string>
<key>PayloadType</key>
<string>com.apple.security.pkcs12</string>
<key>PayloadUUID</key>
<string>$uuid1</string>
<key>PayloadVersion</key>
<integer>1</integer>
</dict>
<dict>
<key>PayloadContent</key>
<data>
$ca_base64
</data>
<key>PayloadCertificateFileName</key>
<string>ikev2vpnca</string>
<key>PayloadDescription</key>
<string>Adds a CA root certificate</string>
<key>PayloadDisplayName</key>
<string>Certificate Authority (CA)</string>
<key>PayloadIdentifier</key>
<string>com.apple.security.root.$(uuidgen)</string>
<key>PayloadType</key>
<string>com.apple.security.root</string>
<key>PayloadUUID</key>
<string>$(uuidgen)</string>
<key>PayloadVersion</key>
<integer>1</integer>
</dict>
</array>
<key>PayloadDisplayName</key>
<string>IKEv2 VPN configuration ($server_addr)</string>
<key>PayloadIdentifier</key>
<string>com.apple.vpn.managed.$(uuidgen)</string>
<key>PayloadRemovalDisallowed</key>
<false/>
<key>PayloadType</key>
<string>Configuration</string>
<key>PayloadUUID</key>
<string>$(uuidgen)</string>
<key>PayloadVersion</key>
<integer>1</integer>
</dict>
</plist>
EOF
if [ "$export_to_home_dir" = "1" ]; then
chown "$SUDO_USER:$SUDO_USER" "$mc_file"
fi
chmod 600 "$mc_file"
}
create_android_profile() {
[ -z "$server_addr" ] && get_server_address
p12_base64_oneline=$(base64 -w 52 "$export_dir$client_name.p12" | sed 's/$/\\n/' | tr -d '\n')
[ -z "$p12_base64_oneline" ] && exiterr "Could not encode .p12 file."
uuid2=$(uuidgen)
[ -z "$uuid2" ] && exiterr "Could not generate UUID value."
sswan_file="$export_dir$client_name.sswan"
cat > "$sswan_file" <<EOF
{
"uuid": "$uuid2",
"name": "IKEv2 VPN profile ($server_addr)",
"type": "ikev2-cert",
"remote": {
"addr": "$server_addr"
},
"local": {
"p12": "$p12_base64_oneline",
"rsa-pss": "true"
},
"ike-proposal": "aes256-sha256-modp2048",
"esp-proposal": "aes256gcm16"
}
EOF
if [ "$export_to_home_dir" = "1" ]; then
chown "$SUDO_USER:$SUDO_USER" "$sswan_file"
fi
chmod 600 "$sswan_file"
}
create_ca_server_certs() {
bigecho "Generating CA and server certificates..."
certutil -z <(head -c 1024 /dev/urandom) \
-S -x -n "IKEv2 VPN CA" \
-s "O=IKEv2 VPN,CN=IKEv2 VPN CA" \
-k rsa -v 120 \
-d sql:/etc/ipsec.d -t "CT,," -2 >/dev/null 2>&1 <<ANSWERS || exiterr "Failed to create CA certificate."
y
N
ANSWERS
sleep $((RANDOM % 3 + 1))
if [ "$use_dns_name" = "1" ]; then
certutil -z <(head -c 1024 /dev/urandom) \
-S -c "IKEv2 VPN CA" -n "$server_addr" \
-s "O=IKEv2 VPN,CN=$server_addr" \
-k rsa -v 120 \
-d sql:/etc/ipsec.d -t ",," \
--keyUsage digitalSignature,keyEncipherment \
--extKeyUsage serverAuth \
--extSAN "dns:$server_addr" >/dev/null 2>&1 || exiterr "Failed to create server certificate."
else
certutil -z <(head -c 1024 /dev/urandom) \
-S -c "IKEv2 VPN CA" -n "$server_addr" \
-s "O=IKEv2 VPN,CN=$server_addr" \
-k rsa -v 120 \
-d sql:/etc/ipsec.d -t ",," \
--keyUsage digitalSignature,keyEncipherment \
--extKeyUsage serverAuth \
--extSAN "ip:$server_addr,dns:$server_addr" >/dev/null 2>&1 || exiterr "Failed to create server certificate."
fi
}
add_ikev2_connection() {
bigecho "Adding a new IKEv2 connection..."
if ! grep -qs '^include /etc/ipsec\.d/\*\.conf$' /etc/ipsec.conf; then
echo >> /etc/ipsec.conf
echo 'include /etc/ipsec.d/*.conf' >> /etc/ipsec.conf
fi
cat > /etc/ipsec.d/ikev2.conf <<EOF
conn ikev2-cp
left=%defaultroute
leftcert=$server_addr
leftsendcert=always
leftsubnet=0.0.0.0/0
leftrsasigkey=%cert
right=%any
rightid=%fromcert
rightaddresspool=192.168.43.10-192.168.43.250
rightca=%same
rightrsasigkey=%cert
narrowing=yes
dpddelay=30
dpdtimeout=120
dpdaction=clear
auto=add
ikev2=insist
rekey=no
pfs=no
fragmentation=yes
ike=aes256-sha2,aes128-sha2,aes256-sha1,aes128-sha1,aes256-sha2;modp1024,aes128-sha1;modp1024
phase2alg=aes_gcm-null,aes128-sha1,aes256-sha1,aes128-sha2,aes256-sha2
ikelifetime=24h
salifetime=24h
encapsulation=yes
EOF
if [ "$use_dns_name" = "1" ]; then
cat >> /etc/ipsec.d/ikev2.conf <<EOF
leftid=@$server_addr
EOF
else
cat >> /etc/ipsec.d/ikev2.conf <<EOF
leftid=$server_addr
EOF
fi
case $swan_ver in
3.2[35679]|3.3[12]|4.*)
if [ -n "$dns_server_2" ]; then
cat >> /etc/ipsec.d/ikev2.conf <<EOF
modecfgdns="$dns_servers"
EOF
else
cat >> /etc/ipsec.d/ikev2.conf <<EOF
modecfgdns=$dns_server_1
EOF
fi
if [ "$mobike_enable" = "1" ]; then
echo " mobike=yes" >> /etc/ipsec.d/ikev2.conf
else
echo " mobike=no" >> /etc/ipsec.d/ikev2.conf
fi
;;
3.19|3.2[012])
if [ -n "$dns_server_2" ]; then
cat >> /etc/ipsec.d/ikev2.conf <<EOF
modecfgdns1=$dns_server_1
modecfgdns2=$dns_server_2
EOF
else
cat >> /etc/ipsec.d/ikev2.conf <<EOF
modecfgdns1=$dns_server_1
EOF
fi
;;
esac
}
apply_ubuntu1804_nss_fix() {
if [ "$os_type" = "ubuntu" ] && [ "$os_ver" = "bustersid" ] && [ "$os_arch" = "x86_64" ]; then
nss_url1="https://mirrors.kernel.org/ubuntu/pool/main/n/nss"
nss_url2="https://mirrors.kernel.org/ubuntu/pool/universe/n/nss"
nss_deb1="libnss3_3.49.1-1ubuntu1.5_amd64.deb"
nss_deb2="libnss3-dev_3.49.1-1ubuntu1.5_amd64.deb"
nss_deb3="libnss3-tools_3.49.1-1ubuntu1.5_amd64.deb"
TMPDIR=$(mktemp -d /tmp/nss.XXX 2>/dev/null)
if [ -d "$TMPDIR" ]; then
bigecho "Applying fix for NSS bug on Ubuntu 18.04..."
export DEBIAN_FRONTEND=noninteractive
set -x
if wget -t 3 -T 30 -q -O "$TMPDIR/1.deb" "$nss_url1/$nss_deb1" \
&& wget -t 3 -T 30 -q -O "$TMPDIR/2.deb" "$nss_url1/$nss_deb2" \
&& wget -t 3 -T 30 -q -O "$TMPDIR/3.deb" "$nss_url2/$nss_deb3"; then
apt-get -yqq update
apt-get -yqq install "$TMPDIR/1.deb" "$TMPDIR/2.deb" "$TMPDIR/3.deb" >/dev/null
fi
{ set +x; } 2>&-
/bin/rm -f "$TMPDIR/1.deb" "$TMPDIR/2.deb" "$TMPDIR/3.deb"
/bin/rmdir "$TMPDIR"
fi
fi
}
restart_ipsec_service() {
if [ "$in_container" = "0" ] || { [ "$in_container" = "1" ] && service ipsec status >/dev/null 2>&1; } then
bigecho "Restarting IPsec service..."
mkdir -p /run/pluto
service ipsec restart 2>/dev/null
fi
}
print_client_added_message() {
cat <<EOF
================================================
New IKEv2 VPN client "$client_name" added!
VPN server address: $server_addr
VPN client name: $client_name
EOF
}
print_client_exported_message() {
cat <<EOF
================================================
IKEv2 VPN client "$client_name" exported!
VPN server address: $server_addr
VPN client name: $client_name
EOF
}
show_swan_update_info() {
if printf '%s' "$swan_ver_latest" | grep -Eq '^([3-9]|[1-9][0-9])\.([0-9]|[1-9][0-9])$' \
&& [ "$swan_ver" != "$swan_ver_latest" ] \
&& printf '%s\n%s' "$swan_ver" "$swan_ver_latest" | sort -C -V; then
echo
echo "Note: A newer version of Libreswan ($swan_ver_latest) is available."
if [ "$in_container" = "0" ]; then
echo " To update, run:"
update_url=vpnupgrade
if [ "$os_type" = "centos" ] || [ "$os_type" = "rhel" ]; then
update_url=vpnupgrade-centos
elif [ "$os_type" = "amzn" ]; then
update_url=vpnupgrade-amzn
fi
echo " wget https://git.io/$update_url -O vpnupgrade.sh"
echo " sudo sh vpnupgrade.sh"
else
echo " To update this Docker image, see: https://git.io/updatedockervpn"
fi
fi
}
print_setup_complete_message() {
cat <<EOF
================================================
IKEv2 VPN setup is now complete!
VPN server address: $server_addr
VPN client name: $client_name
EOF
}
print_client_info() {
cat <<EOF
Client configuration is available at:
$export_dir$client_name.p12 (for Windows)
$export_dir$client_name.sswan (for Android)
$export_dir$client_name.mobileconfig (for iOS & macOS)
EOF
if [ "$use_own_password" = "0" ]; then
cat <<EOF
*IMPORTANT* Password for client config files:
$p12_password
Write this down, you'll need it for import!
EOF
fi
cat <<'EOF'
Next steps: Configure IKEv2 VPN clients. See:
https://git.io/ikev2clients
================================================
EOF
}
check_ipsec_conf() {
if grep -qs "conn ikev2-cp" /etc/ipsec.conf; then
echo "Error: IKEv2 configuration section found in /etc/ipsec.conf." >&2
echo " This script cannot automatically remove IKEv2 from this server." >&2
echo " To manually remove IKEv2, see https://git.io/ikev2" >&2
echo "Abort. No changes were made." >&2
exit 1
fi
}
confirm_remove_ikev2() {
echo
echo "WARNING: This option will remove IKEv2 from this VPN server, but keep the IPsec/L2TP"
echo " and IPsec/XAuth (\"Cisco IPsec\") modes, if installed. All IKEv2 configuration"
echo " including certificates and keys will be permanently deleted."
echo " This *cannot* be undone! "
echo
printf "Are you sure you want to remove IKEv2? [y/N] "
read -r response
case $response in
[yY][eE][sS]|[yY])
echo
;;
*)
echo "Abort. No changes were made."
exit 1
;;
esac
}
delete_ikev2_conf() {
bigecho "Deleting /etc/ipsec.d/ikev2.conf..."
/bin/rm -f /etc/ipsec.d/ikev2.conf
}
delete_certificates() {
bigecho "Deleting certificates and keys from the IPsec database..."
certutil -L -d sql:/etc/ipsec.d | grep -v -e '^$' -e 'IKEv2 VPN CA' | tail -n +3 | cut -f1 -d ' ' | while read -r line; do
certutil -F -d sql:/etc/ipsec.d -n "$line"
certutil -D -d sql:/etc/ipsec.d -n "$line" 2>/dev/null
done
certutil -F -d sql:/etc/ipsec.d -n "IKEv2 VPN CA"
certutil -D -d sql:/etc/ipsec.d -n "IKEv2 VPN CA" 2>/dev/null
}
print_ikev2_removed_message() {
echo "IKEv2 removed!"
}
ikev2setup() {
check_run_as_root
check_os_type
check_swan_install
check_utils_exist
check_container
use_defaults=0
add_client_using_defaults=0
export_client_using_defaults=0
list_clients=0
remove_ikev2=0
while [ "$#" -gt 0 ]; do
case $1 in
--auto)
use_defaults=1
shift
;;
--addclient)
add_client_using_defaults=1
client_name="$2"
shift
shift
;;
--exportclient)
export_client_using_defaults=1
client_name="$2"
shift
shift
;;
--listclients)
list_clients=1
shift
;;
--removeikev2)
remove_ikev2=1
shift
;;
-h|--help)
show_usage
;;
*)
show_usage "Unknown parameter: $1"
;;
esac
done
check_arguments
get_export_dir
if [ "$add_client_using_defaults" = "1" ]; then
show_add_client_message
client_validity=120
use_own_password=0
create_client_cert
install_base64_uuidgen
export_p12_file
create_mobileconfig
create_android_profile
print_client_added_message
print_client_info
exit 0
fi
if [ "$export_client_using_defaults" = "1" ]; then
show_export_client_message
use_own_password=0
install_base64_uuidgen
export_p12_file
create_mobileconfig
create_android_profile
print_client_exported_message
print_client_info
exit 0
fi
if [ "$list_clients" = "1" ]; then
list_existing_clients
exit 0
fi
if [ "$remove_ikev2" = "1" ]; then
check_ipsec_conf
confirm_remove_ikev2
delete_ikev2_conf
restart_ipsec_service
delete_certificates
print_ikev2_removed_message
exit 0
fi
if grep -qs "conn ikev2-cp" /etc/ipsec.conf || [ -f /etc/ipsec.d/ikev2.conf ]; then
select_menu_option
case $selected_option in
1)
enter_client_name
enter_client_cert_validity
select_p12_password
create_client_cert
install_base64_uuidgen
export_p12_file
create_mobileconfig
create_android_profile
print_client_added_message
print_client_info
exit 0
;;
2)
enter_client_name_for_export
select_p12_password
install_base64_uuidgen
export_p12_file
create_mobileconfig
create_android_profile
print_client_exported_message
print_client_info
exit 0
;;
3)
echo
list_existing_clients
exit 0
;;
4)
check_ipsec_conf
confirm_remove_ikev2
delete_ikev2_conf
restart_ipsec_service
delete_certificates
print_ikev2_removed_message
exit 0
;;
*)
exit 0
;;
esac
fi
check_ca_cert_exists
check_swan_ver
if [ "$use_defaults" = "0" ]; then
select_swan_update
show_welcome_message
enter_server_address
check_server_cert_exists
enter_client_name_with_defaults
enter_client_cert_validity
enter_custom_dns
check_mobike_support
select_mobike
select_p12_password
confirm_setup_options
else
check_server_dns_name
check_custom_dns
show_start_message
if [ -n "$VPN_DNS_NAME" ]; then
use_dns_name=1
server_addr="$VPN_DNS_NAME"
else
use_dns_name=0
get_server_ip
check_ip "$public_ip" || exiterr "Cannot detect this server's public IP."
server_addr="$public_ip"
fi
check_server_cert_exists
client_name=vpnclient
check_client_cert_exists
client_validity=120
if [ -n "$VPN_DNS_SRV1" ] && [ -n "$VPN_DNS_SRV2" ]; then
dns_server_1="$VPN_DNS_SRV1"
dns_server_2="$VPN_DNS_SRV2"
dns_servers="$VPN_DNS_SRV1 $VPN_DNS_SRV2"
elif [ -n "$VPN_DNS_SRV1" ]; then
dns_server_1="$VPN_DNS_SRV1"
dns_server_2=""
dns_servers="$VPN_DNS_SRV1"
else
dns_server_1=8.8.8.8
dns_server_2=8.8.4.4
dns_servers="8.8.8.8 8.8.4.4"
fi
check_mobike_support
mobike_enable="$mobike_support"
use_own_password=0
fi
apply_ubuntu1804_nss_fix
create_ca_server_certs
create_client_cert
install_base64_uuidgen
export_p12_file
create_mobileconfig
create_android_profile
add_ikev2_connection
restart_ipsec_service
if [ "$use_defaults" = "1" ]; then
show_swan_update_info
fi
print_setup_complete_message
print_client_info
}
## Defer setup until we have the complete script
ikev2setup "$@"
exit 0
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